2443645 has 4 divisors (see below), whose sum is σ = 2932380. Its totient is φ = 1954912.

The previous prime is 2443643. The next prime is 2443657. The reversal of 2443645 is 5463442.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5463442 = 2 ⋅2731721.

It can be written as a sum of positive squares in 2 ways, for example, as 840889 + 1602756 = 917^2 + 1266^2 .

It is a cyclic number.

It is not a de Polignac number, because 2443645 - 2¹ = 2443643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2443643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244360 + ... + 244369.

It is an arithmetic number, because the mean of its divisors is an integer number (733095).

2^2443645 is an apocalyptic number.

It is an amenable number.

2443645 is a deficient number, since it is larger than the sum of its proper divisors (488735).

2443645 is an equidigital number, since it uses as much as digits as its factorization.

2443645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488734.

The product of its digits is 11520, while the sum is 28.

The square root of 2443645 is about 1563.2162358420. The cubic root of 2443645 is about 134.6933138731.

The spelling of 2443645 in words is "two million, four hundred forty-three thousand, six hundred forty-five".